Document mutation-testing workflow contract tests - #297
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Summary
WalkthroughDocument the mutation-testing workflow contract, its pin-only decision, and its contract-test coverage. Reformat three execution-plan sections without changing their documented behaviour or test evidence. ChangesMutation-testing contract documentation
Execution-plan formatting
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🧪 Generate unit tests (beta)
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In `@docs/developers-guide.md`:
- Line 279: Update the documentation text near “job summary” to use the required
British spelling “artefacts” instead of “artifacts,” preserving the surrounding
wording.
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Inline comments:
In `@docs/adr-004-pin-only-mutation-testing-contract.md`:
- Around line 5-11: Update the acceptance date in the ADR heading and the
corresponding Date section to the actual non-future acceptance date, replacing
both occurrences of 2026-07-23 consistently.
- Around line 38-56: Replace the prose-only “Options considered” list in the ADR
with a comparison table covering Options A, B, and C across feasibility,
mutation coverage, operational risk, and other relevant dimensions. Preserve
each option’s existing rationale, and add a caption directly below the table.
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In `@docs/execplans/8-2-1-create-the-rstest-helper-lint-crate.md`:
- Around line 347-350: Update the documented nextest command to use a single
filter, removing the extra resolution filter and whitespace so it targets only
validate_crate_names_variants; correct the accompanying documented test count to
five, or explicitly select the profile required to include the dry-run test.
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Add a "Mutation-testing workflow contract tests" section to the developer's guide describing the thin caller workflow, its configuration, the pin-only adoption rationale (dylint crates needing per-target RUSTFLAGS that the shared workflow cannot reproduce), and the local command for running the contract test suite.
Preserve the architectural constraint that the shared mutation workflow cannot reproduce Whitaker's per-crate test flags. Document the accepted declared-configuration contract and link it from the maintainer guide.
Record the decision's accepted date in UTC and compare the rejected alternatives explicitly. Restructure the affected historical ExecPlans so their long signatures and commands remain lint-compliant after formatting.
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Restore the Markdown spacing rule before the mutation-testing section so the documentation lint remains clean after the rebase.
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Summary
docs/developers-guide.md, inserted between "Running Tests" and "Proofworkflows" (the guide has no existing mutation-testing section and no
table of contents/index to cross-link, so this is a new top-level
##section with no TOC entry to add).
.github/workflows/mutation-testing.yml,which delegates to
leynos/shared-actions/.github/workflows/mutation-cargo.ymlpinned at
927edd45ae77be4251a8a18ca9eb5613a2e32cbd, its realwith:inputs (
paths,exclude-globs,extra-args: --all-features), and thecontract test at
tests/workflow_contracts/mutation_testing_test.py.the mutation caller's
exclude-globsdoes not (and cannot) fully mirrormake test'sTEST_EXCLUDES, because the excluded crates(
whitaker,function_attrs_follow_docs,module_max_lines,no_expect_outside_tests) usefeature(rustc_private)under thedylint-driverfeature and need the dynamic-linkingRUSTFLAGS(
-C prefer-dynamic -Z force-unstable-if-unmarked) injected only by thetest/typecheckMakefile targets — see the note in.cargo/config.toml. The shared mutation workflow has no equivalentper-crate RUSTFLAGS step, so this repository does not (and cannot) run a
full
--test-workspacemutation baseline matching the CI test scopewholesale. The section states this honestly rather than claiming parity.
Details
USES_REregex asserting a full40-hex commit SHA pin, not a hard-coded value), so Dependabot bumps the
pin without an accompanying test edit. No
pytestmark/skipifguard ispresent or needed — this is a Rust workspace, not a Python package whose
tests run inside a mutmut sandbox.
make test-workflow-contracts, which wrapsuv run --with 'pytest>=8' --with 'pyyaml>=6' pytest tests/workflow_contracts -q.docs/roadmap.mdanddocs/execplans/*— no task references mutation testing or this docwork, so no roadmap/execplan tracking applies and none was
annotated.
make markdownlint(spelling viatypos, thenmarkdownlint-cli2across all 69 Markdown files in the repository).Both passed with zero errors after fixing two
-ise/-izespellingissues (
summarising→summarizing,serialises→serializes) thatthe new section introduced.
Deviations from the template
extra-argswould carry a--test-workspace/--workspaceflag; whitaker's caller instead usesextra-args: --all-features(matching the Makefile'sCARGO_FLAGSfeature baseline), with workspace-wide coverage coming from the
pathsinput rather than a mutants flag. The section documents the real value
and explains the pin-only reasoning instead.
Edited files:
docs/developers-guide.md,docs/contents.md, anddocs/adr-004-pin-only-mutation-testing-contract.md.References
Summary by Sourcery
Document and formalize the pin-only mutation-testing workflow contract and its accepted scope limitations.
Enhancements:
Documentation: